Siemens SIMATIC User Manual

Analog modules
6.9 Analog input module SM 331; AI 8 x RTD; (6ES7331-7PF01-0AB0)
S7-300 Module data
Manual, 06/2017, A5E00105505-AJ
385
Technical specifications
Temperature error (in relation to input range)
• Resistance thermometer
• Resistor
± 0.015 °C/K
± 0.005 %/K
Linearity error (referenced to input range)
• Resistance thermometer
• Resistor
± 0.2 °C
± 0.02 %
Repeat accuracy (in steady state at 25 °C, referenced to input
range)
• Resistance thermometer
• Resistor
± 0.2 °C
± 0.01 %
Status, interrupts, diagnostics
Interrupts
• Hardware interrupt
• Diagnostics interrupt
Configurable (channels 0-7)
Configurable
Diagnostics function
• Group error display
• Diagnostic information can be read
Configurable
Red LED (group error)
possible
Encoder selection data
Input range (rated values) input resistance
• Resistance thermometer
• Resistor
Pt 10, Pt 50, Pt 100, Pt 200, Pt 500, Pt 1000,
Ni 100, Ni 120, Ni 200, Ni 500, Ni 1000, LG-Ni
1000, Cu 10, Cu 50, Cu 100 (standard and climatic)
150, 300, 600 Ω
Permissible input voltage at voltage input (destruction limit) 35 V DC continuous 75 V DC for max. 1 s (duty
cycle 1 : 20)
Wiring of the signal transmitters
• for resistance measurement
with 2-wire connection
with 3-wire connection
with 4-wire connection
with 40-pin front connector
possible
possible***
possible
Characteristic linearization
• Resistance thermometer
• Technical unit for temperature measurement
Pt 10, Pt 50, Pt 100, Pt 200, Pt 500, Pt 1000,
Ni 100, Ni 120, Ni 200, Ni 500, Ni 1000, LG-Ni
1000, Cu 10, Cu 50, Cu 100 (standard and climatic)
Degrees Celsius / degrees Fahrenheit
* The resistance test for compensation of the line resistances with a 3-wire connection is performed every 5 minutes.
** Wire break monitoring in 4-channel mode (hardware filter) is performed every 3 seconds.
*** The maximum line resistance with 3-wire encoder measurements for the RTD elements PT 10 and Cu 10 is 10 Ω. For
all other RTD elements, the maximum power resistance for 3-wire encoder measurements is 20 Ω.
**** In 4-channel mode, the converted value settles to 100% within 80 ms. The value determined in this process is
switched typically every 3.3 ms (max. 10 ms).

Siemens SIMATIC Specifications

General

Product type designation	SIMATIC
CPU	Varies by model
Memory	Varies by model
Input/Output	Varies by model
Communication	Varies by model
Programming Language	STEP 7
Operating Temperature	0°C to 60°C (varies by model)
Protection Class	IP20
Category	Programmable Logic Controller (PLC)